avcodec: always emulate edges

The performance gains from not emulating edges was low if any, if not
negative. In any case, this was for non-DR cases only, so so much for
performance...

Also do not bother setting the flag at all with newer versions as it
was deprecated, and the underlying feature is always on.

modules/codec/avcodec/video.c

@@ -398,16 +398,9 @@ int InitVideoDec( decoder_t *p_dec, AVCodecContext *p_context,
         p_sys->b_direct_rendering = true;
     }
 
-    if( p_sys->b_direct_rendering )
-    {
-        msg_Dbg( p_dec, "trying to use direct rendering" );
-        p_context->flags |= CODEC_FLAG_EMU_EDGE;
-    }
-    else
-    {
-        msg_Dbg( p_dec, "direct rendering is disabled" );
-    }
-
+#if !LIBAVCODEC_VERSION_CHECK(55, 32, 1, 48, 102)
+    p_context->flags |= CODEC_FLAG_EMU_EDGE;
+#endif
     p_context->get_format = ffmpeg_GetFormat;
     /* Always use our get_buffer wrapper so we can calculate the
      * PTS correctly */